The PlayStation Portable absolutely killed it in Japan last week, sales-wise, gobbling up a huge portion of the hardware sales market and giving Sony the dominant portion of the pie. Who's responsible?

The one-two punch of MonHun Nikki: Poka Poka Ailu Mura and Ace Combat: Joint Assault helped propel the PSP to sweet sales last week, according to sales tracker Media Create. Neither did much for the PSP's UMD-less sibling, which still languishes in last place.